Why does my front facing camera look great in some apps and terrible in others?

This is something I've been putting up with for a while, but I'd really like to find out the reason/if there is some sort of fix for it. My front facing camera looks absolutely fine in apps like the HTC camera app, the Google camera app, and Instagram. However apps like Vine seem to give my camera a lot of weird sharpening/bad contrast and just really low quality in general. Anybody know why this could be?